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1/*
2 * Copyright (C) 2013 nu774
3 * For conditions of distribution and use, see copyright notice in COPYING
4 */
5#if HAVE_CONFIG_H
6# include "config.h"
7#endif
8#include <stdio.h>
9#include <stdlib.h>
10#include <string.h>
11#include <time.h>
12#if HAVE_STDINT_H
13# include <stdint.h>
14#endif
15#include "m4af.h"
16#include "m4af_endian.h"
17
18#define m4af_realloc(memory,size) realloc(memory, size)
19#define m4af_free(memory) free(memory)
20
21typedef struct m4af_sample_entry_t {
22 uint32_t size;
23 uint32_t delta;
24} m4af_sample_entry_t;
25
26typedef struct m4af_chunk_entry_t {
27 int64_t offset;
28 uint32_t size;
29 uint32_t samples_per_chunk;
30 uint32_t duration;
31} m4af_chunk_entry_t;
32
33typedef struct m4af_itmf_entry_t {
34 uint32_t type; /* fcc */
35 union {
36 uint32_t type_code;
37 char *name;
38 } u;
39 char *data;
40 uint32_t data_size;
41} m4af_itmf_entry_t;
42
43typedef struct m4af_track_t {
44 uint32_t codec;
45 uint32_t timescale;
46 int64_t creation_time;
47 int64_t modification_time;
48 int64_t duration;
49 uint32_t frame_duration;
50 uint32_t encoder_delay;
51 uint32_t padding;
52 uint8_t *decSpecificInfo;
53 uint32_t decSpecificInfoSize;
54 uint32_t bufferSizeDB;
55 uint32_t maxBitrate;
56 uint32_t avgBitrate;
57
58 m4af_sample_entry_t *sample_table;
59 uint32_t num_samples;
60 uint32_t sample_table_capacity;
61
62 m4af_chunk_entry_t *chunk_table;
63 uint32_t num_chunks;
64 uint32_t chunk_table_capacity;
65
66 uint8_t *chunk_buffer;
67 uint32_t chunk_size;
68 uint32_t chunk_capacity;
69} m4af_track_t;
70
71struct m4af_writer_t {
72 uint32_t timescale;
73 int64_t creation_time;
74 int64_t modification_time;
75 int64_t mdat_pos;
76 int64_t mdat_size;
77 int last_error;
78
79 m4af_itmf_entry_t *itmf_table;
80 uint32_t num_tags;
81 uint32_t itmf_table_capacity;
82
83 m4af_io_callbacks_t io;
84 void *io_cookie;
85
86 uint16_t num_tracks;
87 m4af_track_t track[1];
88};
89
90static
91int64_t m4af_timestamp(void)
92{
93 return (int64_t)(time(0)) + (((1970 - 1904) * 365) + 17) * 24 * 60 * 60;
94}
95
96/*
97 * http://graphics.stanford.edu/~seander/bithacks.html#RoundUpPowerOf2
98 */
99static
100uint32_t m4af_roundup(uint32_t n)
101{
102 n--;
103 n |= n >> 1;
104 n |= n >> 2;
105 n |= n >> 4;
106 n |= n >> 8;
107 n |= n >> 16;
108 n++;
109 return n;
110}
111
112static
113int64_t m4af_tell(m4af_writer_t *ctx)
114{
115 int64_t pos = -1;
116 if (!ctx->last_error && (pos = ctx->io.tell(ctx->io_cookie)) < 0)
117 ctx->last_error = M4AF_IO_ERROR;
118 return pos;
119}
120
121static
122int m4af_set_pos(m4af_writer_t *ctx, int64_t pos)
123{
124 int rc = -1;
125 if (!ctx->last_error &&
126 (rc = ctx->io.seek(ctx->io_cookie, pos, SEEK_SET)) < 0)
127 ctx->last_error = M4AF_IO_ERROR;
128 return rc;
129}
130
131static
132int m4af_write(m4af_writer_t *ctx, const void *data, uint32_t size)
133{
134 int rc = -1;
135 if (!ctx->last_error &&
136 (rc = ctx->io.write(ctx->io_cookie, data, size)) < 0)
137 ctx->last_error = M4AF_IO_ERROR;
138 return rc;
139}
140
141static
142int m4af_write32(m4af_writer_t *ctx, uint32_t data)
143{
144 data = m4af_htob32(data);
145 return m4af_write(ctx, &data, 4);
146}
147
148static
149int m4af_write64(m4af_writer_t *ctx, uint64_t data)
150{
151 data = m4af_htob64(data);
152 return m4af_write(ctx, &data, 8);
153}
154
155static
156int m4af_write24(m4af_writer_t *ctx, uint32_t data)
157{
158 data = m4af_htob32(data << 8);
159 return m4af_write(ctx, &data, 3);
160}
161
162static
163void m4af_write32_at(m4af_writer_t *ctx, int64_t pos, uint32_t value)
164{
165 int64_t current_pos = m4af_tell(ctx);
166 m4af_set_pos(ctx, pos);
167 m4af_write32(ctx, value);
168 m4af_set_pos(ctx, current_pos);
169}
170
171m4af_writer_t *m4af_create(uint32_t codec, uint32_t timescale,
172 m4af_io_callbacks_t *io, void *io_cookie)
173{
174 m4af_writer_t *ctx;
175 int64_t timestamp;
176
177 if (codec != M4AF_FOURCC('m','p','4','a') &&
178 codec != M4AF_FOURCC('a','l','a','c'))
179 return 0;
180 if ((ctx = m4af_realloc(0, sizeof(m4af_writer_t))) == 0)
181 return 0;
182 memset(ctx, 0, sizeof(m4af_writer_t));
183 memcpy(&ctx->io, io, sizeof(m4af_io_callbacks_t));
184 ctx->io_cookie = io_cookie;
185 ctx->timescale = timescale;
186 timestamp = m4af_timestamp();
187 ctx->creation_time = timestamp;
188 ctx->modification_time = timestamp;
189 ctx->num_tracks = 1;
190 ctx->track[0].codec = codec;
191 ctx->track[0].timescale = timescale;
192 ctx->track[0].creation_time = timestamp;
193 ctx->track[0].modification_time = timestamp;
194 return ctx;
195}
196
197void m4af_set_fixed_frame_duration(m4af_writer_t *ctx, int track_idx,
198 uint32_t length)
199{
200 ctx->track[track_idx].frame_duration = length;
201}
202
203int m4af_decoder_specific_info(m4af_writer_t *ctx, int track_idx,
204 uint8_t *data, uint32_t size)
205{
206 m4af_track_t *track = &ctx->track[track_idx];
207 if (size > track->decSpecificInfoSize) {
208 uint8_t *memory = m4af_realloc(track->decSpecificInfo, size);
209 if (memory == 0) {
210 ctx->last_error = M4AF_NO_MEMORY;
211 return -1;
212 }
213 track->decSpecificInfo = memory;
214 }
215 if (size > 0)
216 memcpy(track->decSpecificInfo, data, size);
217 track->decSpecificInfoSize = size;
218 return 0;
219}
220
221void m4af_set_priming(m4af_writer_t *ctx, int track_idx,
222 uint32_t encoder_delay, uint32_t padding)
223{
224 m4af_track_t *track = &ctx->track[track_idx];
225 track->encoder_delay = encoder_delay;
226 track->padding = padding;
227}
228
229static
230int m4af_add_sample_entry(m4af_writer_t *ctx, int track_idx,
231 uint32_t size, uint32_t delta)
232{
233 m4af_track_t *track = &ctx->track[track_idx];
234 m4af_sample_entry_t *entry;
235
236 if (ctx->last_error)
237 return -1;
238 if (track->num_samples == track->sample_table_capacity) {
239 uint32_t new_size = track->sample_table_capacity;
240 new_size = new_size ? new_size * 2 : 1;
241 entry = m4af_realloc(track->sample_table, new_size * sizeof(*entry));
242 if (entry == 0) {
243 ctx->last_error = M4AF_NO_MEMORY;
244 return -1;
245 }
246 track->sample_table = entry;
247 track->sample_table_capacity = new_size;
248 }
249 entry = track->sample_table + track->num_samples;
250 entry->size = size;
251 entry->delta = delta;
252 ++track->num_samples;
253 return 0;
254}
255
256static
257int m4af_flush_chunk(m4af_writer_t *ctx, int track_idx)
258{
259 m4af_track_t *track = &ctx->track[track_idx];
260 m4af_chunk_entry_t *entry;
261 if (!track->num_chunks || !track->chunk_size)
262 return 0;
263 entry = &track->chunk_table[track->num_chunks - 1];
264 entry->offset = m4af_tell(ctx);
265 m4af_write(ctx, track->chunk_buffer, track->chunk_size);
266 ctx->mdat_size += track->chunk_size;
267 track->chunk_size = 0;
268 return ctx->last_error ? -1 : 0;
269}
270
271static
272int m4af_update_chunk_table(m4af_writer_t *ctx, int track_idx,
273 uint32_t size, uint32_t delta)
274{
275 m4af_track_t *track = &ctx->track[track_idx];
276 m4af_chunk_entry_t *entry;
277 int add_new_chunk = 0;
278
279 if (ctx->last_error)
280 return -1;
281 if (track->num_chunks == 0)
282 add_new_chunk = 1;
283 else {
284 entry = &track->chunk_table[track->num_chunks - 1];
285 if (entry->duration + delta > track->timescale / 2)
286 add_new_chunk = 1;
287 }
288 if (add_new_chunk) {
289 m4af_flush_chunk(ctx, track_idx);
290 if (track->num_chunks == track->chunk_table_capacity) {
291 uint32_t new_size = track->chunk_table_capacity;
292 new_size = new_size ? new_size * 2 : 1;
293 entry = m4af_realloc(track->chunk_table, new_size * sizeof(*entry));
294 if (entry == 0) {
295 ctx->last_error = M4AF_NO_MEMORY;
296 return -1;
297 }
298 track->chunk_table = entry;
299 track->chunk_table_capacity = new_size;
300 }
301 memset(&track->chunk_table[track->num_chunks++], 0,
302 sizeof(m4af_chunk_entry_t));
303 }
304 entry = &track->chunk_table[track->num_chunks - 1];
305 entry->size += size;
306 ++entry->samples_per_chunk;
307 entry->duration += delta;
308 return 0;
309}
310
311static
312void m4af_update_max_bitrate(m4af_writer_t *ctx, int track_idx)
313{
314 m4af_track_t *track = &ctx->track[track_idx];
315 uint32_t duration = 0, size = 0, bitrate;
316 m4af_sample_entry_t *ent = track->sample_table + track->num_samples - 1;
317
318 for (; ent >= track->sample_table && duration < track->timescale; --ent) {
319 duration += ent->delta;
320 size += ent->size;
321 }
322 bitrate = (uint32_t)(size * 8.0 * track->timescale / duration + .5);
323 if (bitrate > track->maxBitrate)
324 track->maxBitrate = bitrate;
325}
326
327static
328int m4af_append_sample_to_chunk(m4af_writer_t *ctx, int track_idx,
329 const void *data, uint32_t size)
330{
331 m4af_track_t *track = &ctx->track[track_idx];
332 uint32_t newsize = track->chunk_size + size;
333
334 if (ctx->last_error)
335 return -1;
336 if (track->chunk_capacity < newsize) {
337 uint32_t capacity = m4af_roundup(newsize);
338 uint8_t *memory = realloc(track->chunk_buffer, capacity);
339 if (!memory) {
340 ctx->last_error = M4AF_NO_MEMORY;
341 return -1;
342 }
343 track->chunk_buffer = memory;
344 track->chunk_capacity = capacity;
345 }
346 memcpy(track->chunk_buffer + track->chunk_size, data, size);
347 track->chunk_size = newsize;
348 return 0;
349}
350
351int m4af_write_sample(m4af_writer_t *ctx, int track_idx, const void *data,
352 uint32_t size, uint32_t duration)
353{
354 m4af_track_t *track = &ctx->track[track_idx];
355 if (track->frame_duration)
356 duration = track->frame_duration;
357 if (size > track->bufferSizeDB)
358 track->bufferSizeDB = size;
359 track->duration += duration;
360 m4af_add_sample_entry(ctx, track_idx, size, duration);
361 m4af_update_chunk_table(ctx, track_idx, size, duration);
362 m4af_update_max_bitrate(ctx, track_idx);
363 m4af_append_sample_to_chunk(ctx, track_idx, data, size);
364 return ctx->last_error ? -1 : 0;
365}
366
367static
368int m4af_add_itmf_entry(m4af_writer_t *ctx)
369{
370 m4af_itmf_entry_t *entry;
371 if (ctx->num_tags == ctx->itmf_table_capacity) {
372 uint32_t new_size = ctx->itmf_table_capacity;
373 new_size = new_size ? new_size * 2 : 1;
374 entry = m4af_realloc(ctx->itmf_table, new_size * sizeof(*entry));
375 if (entry == 0) {
376 ctx->last_error = M4AF_NO_MEMORY;
377 return -1;
378 }
379 ctx->itmf_table = entry;
380 ctx->itmf_table_capacity = new_size;
381 }
382 ++ctx->num_tags;
383 return 0;
384}
385
386int m4af_add_itmf_long_tag(m4af_writer_t *ctx, const char *name,
387 const char *data)
388{
389 m4af_itmf_entry_t *entry;
390 size_t name_len = strlen(name);
391 size_t data_len = strlen(data);
392 char *name_copy = m4af_realloc(0, name_len + 1);
393 char *data_copy = m4af_realloc(0, data_len);
394 if (!name_copy || !data_copy) {
395 ctx->last_error = M4AF_NO_MEMORY;
396 goto FAIL;
397 }
398 if (m4af_add_itmf_entry(ctx) < 0)
399 goto FAIL;
400 memcpy(name_copy, name, name_len + 1);
401 memcpy(data_copy, data, data_len);
402 entry = ctx->itmf_table + ctx->num_tags - 1;
403 entry->type = M4AF_FOURCC('-','-','-','-');
404 entry->u.name = name_copy;
405 entry->data = data_copy;
406 entry->data_size = data_len;
407 return 0;
408FAIL:
409 if (name_copy)
410 m4af_free(name_copy);
411 if (data_copy)
412 m4af_free(data_copy);
413 return -1;
414}
415
416int m4af_add_itmf_short_tag(m4af_writer_t *ctx, uint32_t type,
417 uint32_t type_code, const void *data,
418 uint32_t data_size)
419{
420 m4af_itmf_entry_t *entry;
421 char *data_copy = m4af_realloc(0, data_size);
422 if (!data_copy) {
423 ctx->last_error = M4AF_NO_MEMORY;
424 goto FAIL;
425 }
426 if (m4af_add_itmf_entry(ctx) < 0)
427 goto FAIL;
428 entry = ctx->itmf_table + ctx->num_tags - 1;
429 entry->type = type;
430 entry->u.type_code = type_code;
431 memcpy(data_copy, data, data_size);
432 entry->data = data_copy;
433 entry->data_size = data_size;
434 return 0;
435FAIL:
436 if (data_copy)
437 m4af_free(data_copy);
438 return -1;
439}
440
441int m4af_add_itmf_string_tag(m4af_writer_t *ctx, uint32_t type,
442 const char *data)
443{
444 return m4af_add_itmf_short_tag(ctx, type, M4AF_UTF8, data, strlen(data));
445}
446
447int m4af_add_itmf_int8_tag(m4af_writer_t *ctx, uint32_t type, int value)
448{
449 uint8_t data = value;
450 return m4af_add_itmf_short_tag(ctx, type, M4AF_INTEGER, &data, 1);
451}
452
453int m4af_add_itmf_int16_tag(m4af_writer_t *ctx, uint32_t type, int value)
454{
455 uint16_t data = m4af_htob16(value);
456 return m4af_add_itmf_short_tag(ctx, type, M4AF_INTEGER, &data, 2);
457}
458
459int m4af_add_itmf_int32_tag(m4af_writer_t *ctx, uint32_t type, uint32_t value)
460{
461 uint32_t data = m4af_htob32(value);
462 return m4af_add_itmf_short_tag(ctx, type, M4AF_INTEGER, &data, 4);
463}
464
465int m4af_add_itmf_int64_tag(m4af_writer_t *ctx, uint32_t type, uint64_t value)
466{
467 uint64_t data = m4af_htob64(value);
468 return m4af_add_itmf_short_tag(ctx, type, M4AF_INTEGER, &data, 8);
469}
470
471int m4af_add_itmf_track_tag(m4af_writer_t *ctx, int track, int total)
472{
473 uint16_t data[4] = { 0 };
474 data[1] = m4af_htob16(track);
475 data[2] = m4af_htob16(total);
476 return m4af_add_itmf_short_tag(ctx, M4AF_FOURCC('t','r','k','n'),
477 M4AF_IMPLICIT, &data, 8);
478}
479
480int m4af_add_itmf_disk_tag(m4af_writer_t *ctx, int disk, int total)
481{
482 uint16_t data[3] = { 0 };
483 data[1] = m4af_htob16(disk);
484 data[2] = m4af_htob16(total);
485 return m4af_add_itmf_short_tag(ctx, M4AF_FOURCC('d','i','s','k'),
486 M4AF_IMPLICIT, &data, 6);
487}
488
489int m4af_add_itmf_genre_tag(m4af_writer_t *ctx, int genre)
490{
491 uint16_t data = m4af_htob16(genre);
492 return m4af_add_itmf_short_tag(ctx, M4AF_FOURCC('g','n','r','e'),
493 M4AF_IMPLICIT, &data, 2);
494}
495
496static
497int m4af_set_iTunSMPB(m4af_writer_t *ctx)
498{
499 const char *template = " 00000000 %08X %08X %08X%08X 00000000 00000000 "
500 "00000000 00000000 00000000 00000000 00000000 00000000";
501 m4af_track_t *track = &ctx->track[0];
502 char buf[256];
503 uint64_t length = track->duration - track->encoder_delay - track->padding;
504 sprintf(buf, template, track->encoder_delay, track->padding,
505 (uint32_t)(length >> 32), (uint32_t)length);
506 return m4af_add_itmf_long_tag(ctx, "iTunSMPB", buf);
507}
508
509static
510void m4af_update_size(m4af_writer_t *ctx, int64_t pos)
511{
512 int64_t current_pos = m4af_tell(ctx);
513 m4af_set_pos(ctx, pos);
514 m4af_write32(ctx, current_pos - pos);
515 m4af_set_pos(ctx, current_pos);
516}
517
518static
519void m4af_descriptor(m4af_writer_t *ctx, uint32_t tag, uint32_t size)
520{
521 uint8_t buf[5];
522 buf[0] = tag;
523 buf[1] = ((size >> 21) | 0x80);
524 buf[2] = ((size >> 14) | 0x80);
525 buf[3] = ((size >> 7) | 0x80);
526 buf[4] = (size & 0x7f);
527 m4af_write(ctx, buf, 5);
528}
529
530static
531void m4af_ftyp_box(m4af_writer_t *ctx)
532{
533 m4af_write(ctx, "\0\0\0\040""ftypM4A \0\0\0\0M4A mp42isom\0\0\0\0", 32);
534}
535
536static
537void m4af_free_box(m4af_writer_t *ctx, uint32_t size)
538{
539 int64_t pos = m4af_tell(ctx);
540 m4af_write32(ctx, size + 8);
541 m4af_write(ctx, "free", 4);
542 if (size > 0)
543 m4af_set_pos(ctx, pos + size + 8);
544}
545
546int m4af_begin_write(m4af_writer_t *ctx)
547{
548 m4af_ftyp_box(ctx);
549 m4af_free_box(ctx, 0);
550 m4af_write(ctx, "\0\0\0\0mdat", 8);
551 ctx->mdat_pos = m4af_tell(ctx);
552 return ctx->last_error ? -1 : 0;
553}
554
555static
556void m4af_stco_box(m4af_writer_t *ctx, int track_idx)
557{
558 m4af_track_t *track = &ctx->track[track_idx];
559 uint32_t i;
560 m4af_chunk_entry_t *index = track->chunk_table;
561 int is_co64 = (ctx->mdat_pos + ctx->mdat_size > UINT32_MAX);
562 int64_t pos = m4af_tell(ctx);
563
564 m4af_write32(ctx, 0); /* size */
565 m4af_write(ctx, is_co64 ? "co64" : "stco", 4);
566 m4af_write32(ctx, 0); /* version and flags */
567 m4af_write32(ctx, track->num_chunks);
568 for (i = 0; i < track->num_chunks; ++i, ++index) {
569 if (is_co64)
570 m4af_write64(ctx, index->offset);
571 else
572 m4af_write32(ctx, index->offset);
573 }
574 m4af_update_size(ctx, pos);
575}
576
577static
578void m4af_stsz_box(m4af_writer_t *ctx, int track_idx)
579{
580 m4af_track_t *track = &ctx->track[track_idx];
581 m4af_sample_entry_t *index = track->sample_table;
582 uint32_t i;
583 int64_t pos = m4af_tell(ctx);
584 m4af_write(ctx,
585 "\0\0\0\0" /* size */
586 "stsz" /* type */
587 "\0" /* version */
588 "\0\0\0" /* flags */
589 "\0\0\0\0" /* sample_size: 0(variable) */
590 , 16);
591 m4af_write32(ctx, track->num_samples);
592 for (i = 0; i < track->num_samples; ++i, ++index)
593 m4af_write32(ctx, index->size);
594 m4af_update_size(ctx, pos);
595}
596
597static
598void m4af_stsc_box(m4af_writer_t *ctx, int track_idx)
599{
600 m4af_track_t *track = &ctx->track[track_idx];
601 m4af_chunk_entry_t *index = track->chunk_table;
602 uint32_t i, prev_samples_per_chunk = 0, entry_count = 0;
603 int64_t pos = m4af_tell(ctx);
604 m4af_write(ctx,
605 "\0\0\0\0" /* size */
606 "stsc" /* type */
607 "\0" /* version */
608 "\0\0\0" /* flags */
609 "\0\0\0\0" /* entry_count */
610 , 16);
611
612 for (i = 0; i < track->num_chunks; ++i, ++index) {
613 if (index->samples_per_chunk != prev_samples_per_chunk) {
614 ++entry_count;
615 m4af_write32(ctx, i + 1);
616 m4af_write32(ctx, index->samples_per_chunk);
617 m4af_write32(ctx, 1); /* sample_description_index */
618 prev_samples_per_chunk = index->samples_per_chunk;
619 }
620 }
621 m4af_write32_at(ctx, pos + 12, entry_count);
622 m4af_update_size(ctx, pos);
623}
624
625static
626void m4af_stts_box(m4af_writer_t *ctx, int track_idx)
627{
628 m4af_track_t *track = &ctx->track[track_idx];
629 m4af_sample_entry_t *index = track->sample_table;
630 uint32_t i, prev_delta = 0, entry_count = 0, sample_count = 0;
631 int64_t pos = m4af_tell(ctx);
632 m4af_write(ctx,
633 "\0\0\0\0" /* size */
634 "stts" /* type */
635 "\0" /* version */
636 "\0\0\0" /* flags */
637 "\0\0\0\0" /* entry_count */
638 , 16);
639
640 for (i = 0; i < track->num_samples; ++i, ++index) {
641 if (index->delta == prev_delta)
642 ++sample_count;
643 else {
644 ++entry_count;
645 if (sample_count) {
646 m4af_write32(ctx, sample_count);
647 m4af_write32(ctx, prev_delta);
648 }
649 prev_delta = index->delta;
650 sample_count = 1;
651 }
652 }
653 if (sample_count) {
654 m4af_write32(ctx, sample_count);
655 m4af_write32(ctx, prev_delta);
656 }
657 m4af_write32_at(ctx, pos + 12, entry_count);
658 m4af_update_size(ctx, pos);
659}
660
661static
662void m4af_esds_box(m4af_writer_t *ctx, int track_idx)
663{
664 m4af_track_t *track = &ctx->track[track_idx];
665 int64_t pos = m4af_tell(ctx);
666 m4af_write(ctx, "\0\0\0\0esds", 8);
667 m4af_write32(ctx, 0); /* version + flags */
668
669 /* ES_Descriptor */
670 m4af_descriptor(ctx, 3, 32 + track->decSpecificInfoSize);
671 m4af_write(ctx, "\0\0\0", 3);
672 /* DecoderConfigDescriptor */
673 m4af_descriptor(ctx, 4, 18 + track->decSpecificInfoSize);
674 m4af_write(ctx,
675 "\x40" /* objectTypeIndication: 0x40(Audio ISO/IEC 14496-3)*/
676 "\x15" /* streamType(6): 0x05(AudioStream)
677 * upStream(1) : 0
678 * reserved(1) : 1
679 */
680 , 2);
681 m4af_write24(ctx, track->bufferSizeDB);
682 m4af_write32(ctx, track->maxBitrate);
683 m4af_write32(ctx, track->avgBitrate);
684 /* DecoderSpecificInfo */
685 m4af_descriptor(ctx, 5, track->decSpecificInfoSize);
686 m4af_write(ctx, track->decSpecificInfo, track->decSpecificInfoSize);
687 /* SLConfigDescriptor */
688 m4af_descriptor(ctx, 6, 1);
689 m4af_write(ctx, "\002", 1); /* predefined */
690
691 m4af_update_size(ctx, pos);
692}
693
694static
695void m4af_alac_box(m4af_writer_t *ctx, int track_idx)
696{
697 m4af_track_t *track = &ctx->track[track_idx];
698 int64_t pos = m4af_tell(ctx);
699 m4af_write(ctx,
700 "\0\0\0\0" /* size */
701 "alac" /* type */
702 "\0" /* version */
703 "\0\0\0" /* flags */
704 , 12);
705 m4af_write(ctx, track->decSpecificInfo, track->decSpecificInfoSize);
706 m4af_update_size(ctx, pos);
707}
708
709static
710void m4af_mp4a_box(m4af_writer_t *ctx, int track_idx)
711{
712 m4af_track_t *track = &ctx->track[track_idx];
713 int64_t pos = m4af_tell(ctx);
714 m4af_write32(ctx, 0); /* size */
715 m4af_write32(ctx, track->codec); /* mp4a or alac */
716 m4af_write(ctx,
717 "\0\0\0\0\0\0" /* reserved */
718 "\0\001" /* data_reference_index: 1 */
719 "\0\0\0\0" /* reserved[0] */
720 "\0\0\0\0" /* reserved[1] */
721 "\0\002" /* channelcount: 2 */
722 "\0\020" /* samplesize: 16 */
723 "\0\0" /* pre_defined */
724 "\0\0" /* reserved */
725 ,24);
726 if (track->codec == M4AF_FOURCC('m','p','4','a')) {
727 m4af_write32(ctx, track->timescale << 16);
728 m4af_esds_box(ctx, track_idx);
729 } else {
730 m4af_write32(ctx, 44100);
731 m4af_alac_box(ctx, track_idx);
732 }
733 m4af_update_size(ctx, pos);
734}
735
736static
737void m4af_stsd_box(m4af_writer_t *ctx, int track_idx)
738{
739 int64_t pos = m4af_tell(ctx);
740 m4af_write(ctx, "\0\0\0\0stsd", 8);
741 m4af_write(ctx,
742 "\0" /* version */
743 "\0\0\0" /* flags */
744 "\0\0\0\001" /* entry_count: 1 */
745 , 8);
746 m4af_mp4a_box(ctx, track_idx);
747 m4af_update_size(ctx, pos);
748}
749
750static
751void m4af_stbl_box(m4af_writer_t *ctx, int track_idx)
752{
753 int64_t pos = m4af_tell(ctx);
754 m4af_write(ctx, "\0\0\0\0stbl", 8);
755 m4af_stsd_box(ctx, track_idx);
756 m4af_stts_box(ctx, track_idx);
757 m4af_stsc_box(ctx, track_idx);
758 m4af_stsz_box(ctx, track_idx);
759 m4af_stco_box(ctx, track_idx);
760 m4af_update_size(ctx, pos);
761}
762
763static
764void m4af_url_box(m4af_writer_t *ctx, int track_idx)
765{
766 m4af_write(ctx,
767 "\0\0\0\014" /* size */
768 "url " /* type */
769 "\0" /* version */
770 "\0\0\001" /* flags: 1(in the same file) */
771 , 12);
772}
773
774static
775void m4af_dref_box(m4af_writer_t *ctx, int track_idx)
776{
777 int64_t pos = m4af_tell(ctx);
778 m4af_write(ctx, "\0\0\0\0dref", 8);
779 m4af_write(ctx,
780 "\0" /* version */
781 "\0\0\0" /* flags */
782 "\0\0\0\001" /* entry_count: 1 */
783 ,8);
784 m4af_url_box(ctx, track_idx);
785 m4af_update_size(ctx, pos);
786}
787
788static
789void m4af_dinf_box(m4af_writer_t *ctx, int track_idx)
790{
791 int64_t pos = m4af_tell(ctx);
792 m4af_write(ctx, "\0\0\0\0dinf", 8);
793 m4af_dref_box(ctx, track_idx);
794 m4af_update_size(ctx, pos);
795}
796
797static
798void m4af_smhd_box(m4af_writer_t *ctx, int track_idx)
799{
800 m4af_write(ctx,
801 "\0\0\0\020" /* size */
802 "smhd" /* type */
803 "\0" /* version */
804 "\0\0\0" /* flags */
805 "\0\0" /* balance */
806 "\0\0" /* reserved */
807 , 16);
808}
809
810static
811void m4af_minf_box(m4af_writer_t *ctx, int track_idx)
812{
813 m4af_track_t *track = &ctx->track[track_idx];
814 int64_t pos = m4af_tell(ctx);
815 m4af_write(ctx, "\0\0\0\0minf", 8);
816 /* TODO: add TEXT support */
817 if (track->codec != M4AF_CODEC_TEXT)
818 m4af_smhd_box(ctx, track_idx);
819 m4af_dinf_box(ctx, track_idx);
820 m4af_stbl_box(ctx, track_idx);
821 m4af_update_size(ctx, pos);
822}
823
824static
825void m4af_mdhd_box(m4af_writer_t *ctx, int track_idx)
826{
827 m4af_track_t *track = &ctx->track[track_idx];
828 int64_t pos = m4af_tell(ctx);
829 uint8_t version = (track->creation_time > UINT32_MAX ||
830 track->modification_time > UINT32_MAX ||
831 track->duration > UINT32_MAX);
832
833 m4af_write(ctx, "\0\0\0\0mdhd", 8);
834 m4af_write(ctx, &version, 1);
835 m4af_write(ctx, "\0\0\0", 3); /* flags */
836 if (version) {
837 m4af_write64(ctx, track->creation_time);
838 m4af_write64(ctx, track->modification_time);
839 m4af_write32(ctx, track->timescale);
840 m4af_write64(ctx, track->duration);
841 } else {
842 m4af_write32(ctx, track->creation_time);
843 m4af_write32(ctx, track->modification_time);
844 m4af_write32(ctx, track->timescale);
845 m4af_write32(ctx, track->duration);
846 }
847 m4af_write(ctx,
848 "\x55\xc4" /* language: und */
849 "\0\0" /* pre_defined */
850 , 4);
851 m4af_update_size(ctx, pos);
852}
853
854static
855void m4af_hdlr_box(m4af_writer_t *ctx, int track_idx, const char *type)
856{
857 int64_t pos = m4af_tell(ctx);
858 static const char reserved_and_name[10] = { 0 };
859
860 m4af_write(ctx,
861 "\0\0\0\0" /* size */
862 "hdlr" /* type */
863 "\0" /* version */
864 "\0\0\0" /* flags */
865 "\0\0\0\0" /* pre_defined */
866 , 16);
867 m4af_write(ctx, type, 4); /* handler_type */
868 /* reserved[0] */
869 m4af_write(ctx, !strcmp(type, "mdir") ? "appl" : "\0\0\0\0", 4);
870 /* reserved[1], reserved[2], name */
871 m4af_write(ctx, reserved_and_name, (pos & 1) ? 9 : 10);
872 m4af_update_size(ctx, pos);
873}
874
875static
876void m4af_mdia_box(m4af_writer_t *ctx, int track_idx)
877{
878 m4af_track_t *track = &ctx->track[track_idx];
879 const char *hdlr =
880 (track->codec == M4AF_CODEC_TEXT) ? "text" : "soun";
881 int64_t pos = m4af_tell(ctx);
882 m4af_write(ctx, "\0\0\0\0mdia", 8);
883 m4af_mdhd_box(ctx, track_idx);
884 m4af_hdlr_box(ctx, track_idx, hdlr);
885 m4af_minf_box(ctx, track_idx);
886 m4af_update_size(ctx, pos);
887}
888
889static
890void m4af_tkhd_box(m4af_writer_t *ctx, int track_idx)
891{
892 m4af_track_t *track = &ctx->track[track_idx];
893 int64_t pos = m4af_tell(ctx);
894 int64_t duration =
895 (double)track->duration / track->timescale * ctx->timescale + .5;
896 uint8_t version = (track->creation_time > UINT32_MAX ||
897 track->modification_time > UINT32_MAX ||
898 duration > UINT32_MAX);
899 m4af_write(ctx, "\0\0\0\0tkhd", 8);
900 m4af_write(ctx, &version, 1);
901 m4af_write(ctx, "\0\0\007", 3); /* flags */
902 if (version) {
903 m4af_write64(ctx, track->creation_time);
904 m4af_write64(ctx, track->modification_time);
905 m4af_write32(ctx, track_idx + 1);
906 m4af_write(ctx, "\0\0\0\0" /* reserved */
907 , 4);
908 m4af_write64(ctx, duration);
909 } else {
910 m4af_write32(ctx, track->creation_time);
911 m4af_write32(ctx, track->modification_time);
912 m4af_write32(ctx, track_idx + 1);
913 m4af_write(ctx, "\0\0\0\0" /* reserved */
914 , 4);
915 m4af_write32(ctx, duration);
916 }
917 m4af_write(ctx,
918 "\0\0\0\0" /* reserved[0] */
919 "\0\0\0\0" /* reserved[1] */
920 "\0\0" /* layer */
921 "\0\0" /* alternate_group */
922 "\001\0" /* volume: 1.0 */
923 "\0\0" /* reserved */
924 "\0\001\0\0" /* matrix[0] */
925 "\0\0\0\0" /* matrix[1] */
926 "\0\0\0\0" /* matrix[2] */
927 "\0\0\0\0" /* matrix[3] */
928 "\0\001\0\0" /* matrix[4] */
929 "\0\0\0\0" /* matrix[5] */
930 "\0\0\0\0" /* matrix[6] */
931 "\0\0\0\0" /* matrix[7] */
932 "\100\0\0\0" /* matrix[8] */
933 "\0\0\0\0" /* width */
934 "\0\0\0\0" /* height */
935 , 60);
936 m4af_update_size(ctx, pos);
937}
938
939static
940void m4af_trak_box(m4af_writer_t *ctx, int track_idx)
941{
942 int64_t pos = m4af_tell(ctx);
943 m4af_write(ctx, "\0\0\0\0trak", 8);
944 m4af_tkhd_box(ctx, track_idx);
945 m4af_mdia_box(ctx, track_idx);
946 m4af_update_size(ctx, pos);
947}
948
949static
950int64_t m4af_movie_duration(m4af_writer_t *ctx)
951{
952 int64_t movie_duration = 0;
953 unsigned i;
954 for (i = 0; i < ctx->num_tracks; ++i) {
955 double x = ctx->track[i].duration;
956 int64_t duration = x / ctx->track[i].timescale * ctx->timescale + .5;
957 if (duration > movie_duration)
958 movie_duration = duration;
959 }
960 return movie_duration;
961}
962
963static
964void m4af_mvhd_box(m4af_writer_t *ctx)
965{
966 int64_t pos = m4af_tell(ctx);
967 int64_t movie_duration = m4af_movie_duration(ctx);
968 uint8_t version = (ctx->creation_time > UINT32_MAX ||
969 ctx->modification_time > UINT32_MAX ||
970 movie_duration > UINT32_MAX);
971
972 m4af_write(ctx, "\0\0\0\0mvhd", 8);
973 m4af_write(ctx, &version, 1);
974 m4af_write(ctx, "\0\0\0", 3); /* flags */
975 if (version) {
976 m4af_write64(ctx, ctx->creation_time);
977 m4af_write64(ctx, ctx->modification_time);
978 m4af_write32(ctx, ctx->timescale);
979 m4af_write64(ctx, movie_duration);
980 } else {
981 m4af_write32(ctx, ctx->creation_time);
982 m4af_write32(ctx, ctx->modification_time);
983 m4af_write32(ctx, ctx->timescale);
984 m4af_write32(ctx, movie_duration);
985 }
986 m4af_write(ctx,
987 "\0\001\0\0" /* rate: 1.0 */
988 "\001\0" /* volume: 1.0 */
989 "\0\0" /* reserved */
990 "\0\0\0\0" /* reserved[0] */
991 "\0\0\0\0" /* reserved[1] */
992 "\0\001\0\0" /* matrix[0] */
993 "\0\0\0\0" /* matrix[1] */
994 "\0\0\0\0" /* matrix[2] */
995 "\0\0\0\0" /* matrix[3] */
996 "\0\001\0\0" /* matrix[4] */
997 "\0\0\0\0" /* matrix[5] */
998 "\0\0\0\0" /* matrix[6] */
999 "\0\0\0\0" /* matrix[7] */
1000 "\100\0\0\0" /* matrix[8] */
1001 "\0\0\0\0" /* pre_defined[0] */
1002 "\0\0\0\0" /* pre_defined[1] */
1003 "\0\0\0\0" /* pre_defined[2] */
1004 "\0\0\0\0" /* pre_defined[3] */
1005 "\0\0\0\0" /* pre_defined[4] */
1006 "\0\0\0\0" /* pre_defined[5] */
1007 , 76);
1008 m4af_write32(ctx, ctx->num_tracks + 1);
1009 m4af_update_size(ctx, pos);
1010}
1011
1012static
1013void m4af_mean_box(m4af_writer_t *ctx)
1014{
1015 m4af_write(ctx,
1016 "\0\0\0\034" /* size */
1017 "mean"
1018 "\0" /* version */
1019 "\0\0\0" /* flags */
1020 "com.apple.iTunes" /* meaning-string */
1021 , 28);
1022}
1023
1024static
1025void m4af_name_box(m4af_writer_t *ctx, const char *name)
1026{
1027 int64_t pos = m4af_tell(ctx);
1028 m4af_write(ctx,
1029 "\0\0\0\0" /* size */
1030 "name" /* type */
1031 "\0" /* version */
1032 "\0\0\0" /* flags */
1033 , 12);
1034 m4af_write(ctx, name, strlen(name));
1035 m4af_update_size(ctx, pos);
1036}
1037
1038static
1039void m4af_data_box(m4af_writer_t *ctx, uint32_t type_code,
1040 const char *data, uint32_t data_size)
1041{
1042 int64_t pos = m4af_tell(ctx);
1043 uint8_t code = type_code;
1044 m4af_write(ctx,
1045 "\0\0\0\0" /* size */
1046 "data" /* type */
1047 "\0\0" /* reserved */
1048 "\0" /* type_set_indifier */
1049 ,11);
1050 m4af_write(ctx, &code, 1);
1051 m4af_write(ctx, "\0\0\0\0", 4); /* locale */
1052 m4af_write(ctx, data, data_size);
1053 m4af_update_size(ctx, pos);
1054}
1055
1056static
1057void m4af_write_metadata(m4af_writer_t *ctx, m4af_itmf_entry_t *entry)
1058{
1059 int64_t pos = m4af_tell(ctx);
1060 m4af_write(ctx, "\0\0\0\0", 4);
1061 m4af_write32(ctx, entry->type);
1062 if (entry->type != M4AF_FOURCC('-','-','-','-'))
1063 m4af_data_box(ctx, entry->u.type_code, entry->data, entry->data_size);
1064 else {
1065 m4af_mean_box(ctx);
1066 m4af_name_box(ctx, entry->u.name);
1067 m4af_data_box(ctx, 1, entry->data, entry->data_size);
1068 }
1069 m4af_update_size(ctx, pos);
1070}
1071
1072static
1073void m4af_ilst_box(m4af_writer_t *ctx)
1074{
1075 uint32_t i;
1076 int64_t pos = m4af_tell(ctx);
1077 m4af_write(ctx, "\0\0\0\0ilst", 8);
1078 for (i = 0; i < ctx->num_tags; ++i)
1079 m4af_write_metadata(ctx, &ctx->itmf_table[i]);
1080 m4af_update_size(ctx, pos);
1081}
1082
1083static
1084void m4af_meta_box(m4af_writer_t *ctx)
1085{
1086 int64_t pos = m4af_tell(ctx);
1087 m4af_write(ctx,
1088 "\0\0\0\0" /* size */
1089 "meta" /* type */
1090 "\0" /* version */
1091 "\0\0\0" /* flags */
1092 , 12);
1093 m4af_hdlr_box(ctx, 0, "mdir");
1094 m4af_ilst_box(ctx);
1095 m4af_update_size(ctx, pos);
1096}
1097
1098static
1099void m4af_udta_box(m4af_writer_t *ctx)
1100{
1101 int64_t pos = m4af_tell(ctx);
1102 m4af_write(ctx, "\0\0\0\0udta", 8);
1103 m4af_meta_box(ctx);
1104 m4af_update_size(ctx, pos);
1105}
1106
1107static
1108void m4af_moov_box(m4af_writer_t *ctx)
1109{
1110 unsigned i;
1111 int64_t pos = m4af_tell(ctx);
1112 m4af_write(ctx, "\0\0\0\0moov", 8);
1113 m4af_mvhd_box(ctx);
1114 for (i = 0; i < ctx->num_tracks; ++i)
1115 m4af_trak_box(ctx, i);
1116 if (ctx->num_tags)
1117 m4af_udta_box(ctx);
1118 m4af_update_size(ctx, pos);
1119}
1120
1121static
1122void m4af_finalize_mdat(m4af_writer_t *ctx)
1123{
1124 if (ctx->mdat_size + 8 > UINT32_MAX) {
1125 m4af_set_pos(ctx, ctx->mdat_pos - 16);
1126 m4af_write32(ctx, 1);
1127 m4af_write(ctx, "mdat", 4);
1128 m4af_write64(ctx, ctx->mdat_size + 16);
1129 } else {
1130 m4af_set_pos(ctx, ctx->mdat_pos - 8);
1131 m4af_write32(ctx, ctx->mdat_size + 8);
1132 }
1133 m4af_set_pos(ctx, ctx->mdat_pos + ctx->mdat_size);
1134}
1135
1136int m4af_finalize(m4af_writer_t *ctx)
1137{
1138 unsigned i;
1139 m4af_track_t *track;
1140
1141 for (i = 0; i < ctx->num_tracks; ++i) {
1142 track = ctx->track + i;
1143 if (track->duration) {
1144 int64_t track_size = 0;
1145 unsigned j;
1146 for (j = 0; j < track->num_chunks; ++j)
1147 track_size += track->chunk_table[j].size;
1148 track->avgBitrate =
1149 8.0 * track_size * track->timescale / track->duration + .5;
1150 }
1151 m4af_flush_chunk(ctx, i);
1152 }
1153 if (ctx->track[0].encoder_delay || ctx->track[0].padding)
1154 m4af_set_iTunSMPB(ctx);
1155 m4af_finalize_mdat(ctx);
1156 m4af_moov_box(ctx);
1157 return ctx->last_error ? -1 : 0;
1158}
1159
1160static
1161void m4af_free_itmf_table(m4af_writer_t *ctx)
1162{
1163 uint32_t i;
1164 m4af_itmf_entry_t *entry = ctx->itmf_table;
1165 for (i = 0; i < ctx->num_tags; ++i, ++entry) {
1166 if (entry->type == M4AF_FOURCC('-','-','-','-'))
1167 m4af_free(entry->u.name);
1168 m4af_free(entry->data);
1169 }
1170 m4af_free(ctx->itmf_table);
1171}
1172
1173void m4af_teardown(m4af_writer_t **ctxp)
1174{
1175 unsigned i;
1176 m4af_writer_t *ctx = *ctxp;
1177 m4af_track_t *track;
1178 for (i = 0; i < ctx->num_tracks; ++i) {
1179 track = ctx->track + i;
1180 if (track->decSpecificInfo)
1181 m4af_free(track->decSpecificInfo);
1182 if (track->sample_table)
1183 m4af_free(track->sample_table);
1184 if (track->chunk_table)
1185 m4af_free(track->chunk_table);
1186 if (track->chunk_buffer)
1187 m4af_free(track->chunk_buffer);
1188 }
1189 if (ctx->itmf_table)
1190 m4af_free_itmf_table(ctx);
1191 m4af_free(ctx);
1192 *ctxp = 0;
1193}
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